| 湘南荷花坪锡多金属矿床流体包裹体研究 |
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| 关键词:geochemistry fluid inclusion mineralization Hehuaping tin-polymetallic deposit southern Hunan |
| 基金项目:国家自然科学基金项目(编号: 40972073) |
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| Fliud Inclusion Study of the Hehuaping Tin-polymetallic Deposit in Southern Hunan Province |
| The Hehuaping tin-polymetallic deposit is a large-size tin-polymetallic orefield newly discovered in southern Hunan Province. It consists of Indosinian skarn-type ores and Yanshanian altered-cataclastite-type ores. Four ore bodies have been explored, which are located in the southeast portion of the Wangxianling Indosinian granite pluton and hosted in granite, granite porphyry, and Devonian limestone, dolomitite and sandstone, respectively. Based on detailed field investigation and petrographic observation, the authors carried out microthermometric studies of fluid inclusions in quartz, berylite and calcite in different types of ores. Three stages of Indosinian skarn-type ores have been distinguished, i.e., Stage I–cassiterite and skarn stage, StageⅡ–sulfide stage, and Stage Ⅲ–quartz and calcite stage. Fluid inclusions in the skarn-type ores can be divided into three types: H2O-NaCl type, H2O-NaCl-CO2 type, and minor pure CO2 type. Experimental results show that the homogenization temperatures are from 290℃ to 390℃, from 190℃ to 260℃ and from 140℃ to 180℃ for Stage I, II and III, respectively. The fluid inclusions at Stage I are enriched in CO2, whereas those at the late stage (Stage II, Stage III) are enriched in NaCl-H2O, with minor amounts of Ca2+, Mg2+ ions. In addition, the two major stages of Yanshanian altered cataclastite-type ores have been distinguished: Stage I—cassiterite-sulfide stage, and Stage II—calcite stage. Yanshanian fluid inclusions can be divided into H2O-NaCl type and H2O-NaCl-CO2 type. The homogenization temperatures are from 190℃ to 340℃ and from 130℃ to 170℃ for Stage I and II, respectively. The composition of the fluid inclusions at Stage I are enriched in CO2, whereas those at Stage II are enriched in NaCl-H2O. The characteristics of fluid inclusions in the Hehuaping deposit indicate that the fluid was derived from granites and groundwater. At the early stage the fluid was mainly magmatic fluid, but at later stages the fluid was dominated by groundwater. The fluid that was enriched in CO2 and the fluid that boiled at the early stage possibly led to cassiterite precipitation, and the mineralization of lead and zinc was related to NaCl-H2O fluid. |
| CAI Ming-hai,YU Cun-lin,WANG Xian-bin,LIU Hu,GUO Teng-fei,PENG Zhen-an.2013.Fliud Inclusion Study of the Hehuaping Tin-polymetallic Deposit in Southern Hunan Province[J].Acta Geoscientica Sinica,34(6):654-664. |
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